Piston construction.



A. l. WANNER.

PISON CONSTRUCTION. APPucmoN man APRJ. 1917.

Patented Aug. 28, 1917.

INI/Enron v` WITNESSES 4% 6 w MM UNITED STATES PATENT OFFICE.'

ALBERT J. WANNEB, 0F EAST LIBERTY, OHIO, ASSIGNOR 0F ONE-HALF T0A.VIElIEtNON LESLEY HARRIS, 0F AKRON, OHIO.

PISTON CONSTRUCTION.

Specincation of Letters Patent. Patented Aug. 28,V 4191'?.

Application led April 7, 1917. Serial No. 160,419.

To all 'whom it may concern:

Construction, of which the following is a specification.

The principal object of my invention is to provide for improving andsimplifying the construction and manufacture of pistons, particularly ofthe type used in internal cornustion engines, by making the V wrist inbearings separate from the piston, means eing provided for securing thebearings, in place in the piston when assembling the piston andconnecting rod. This arrangement allows of the wrist pin being securedthe piston without the necessity of having op hoi-ed in the piston wallsforreceiving e wrist pin, whereby the danger, heretofore incidentto`pistons of ordinary construction, of the :wrist pin workout into,engagement with the cylinder wa iseliminated.

The invention is hereinafter fully described and illustrated in theaccompanying drawin z in which lik. charaotersof refer- Ience in catelike parts throughout the several ligues, of which- Figure 1 representsi. view taken transverse y through a piston constructed in accordancewith my invention, the view being taken on the lane indicated bythe line1-1 of Fig. 3, locrng in the direction indicated by the arrows.

Fi 2 represents a view in section taken longitudinally through thepiston on the plane indicated by the line 2-2 of Fig. 3. Fig. 3 reresents a View in section taken lon tudinally through the piston atright a les to Fig. 2, on the line 3 3 of Fig. 2.

eferring more particularly to the draw ings, 5 indicates the pistonwhich is in the form of a cylindrical cup havin plain inner walls, thecylinder being devoi v of the usual bosses or protuberances cast inpistons of usual construction, and which form the bearings for the wristpin. c

According to my invention the bearings 6 for the wrist pin 7, `are eachformed integrally with a segmental plate 8, the outer edge of which iscurved on a line conforming with the curvature of the piston wall. Eachof the plates 8 has one of thel bearings 6 `formed integrally 'with iton its underside,

and the inner or adjacent ends` of the'bearings 6 are formed inte allywith yweb portions 9 which lie in p anes 'at right angles to the planesofthe plates 8, and which Serve to strengthen the bearin s 6. Within thebearings may be insert the sleeves 10'in` which the wrist pin 7 is-4carried.

The outer ends of the sleeves hand of the web portion Q-terminate'shortofitheouter curved edges of the `plates 8, softhatfithese edges are freeto. be inserted within a. groove 11 cut in the innersurface of thepiston walls, and extending entirely aroundthe same. This groove 11, isina planeat rightV angles to the axis of the piston, audit' occurs atthe lower endof the reduced or up er end portion 12 ofthe piston. "Thusa oulder 13 of relativel great'widthis dened atthe upper edge o Y. ve11,"while,a;sho1ildeij 14 'of lesserfwi th :thanfthe"shoulderjdimensions `of the; a plates 8 `are such, that when these platesaremovedfradially of the piston toward Leachv other, Athe edges of theplates will 'be withdrawnfrom the lgroove so as to allow these platesbeingmoved out of the piston. In assembling the piston Vand the wristpin, the pin is first enga d in the bearings of the plates, and theatter are then moved toward each other and then inserted within `thepiston yand moved out wardly away from each' other so that 'the edges ofthe plates will enga in the groove 11. This having been done, t ebearings and plates will bein the position indicated in ig. 2, and inorder to brace the bearings apart and to maintain the plates 8 in seatedposition within the groove, the lookin pins 15, in a bent condition, asshown in the ower portion of Fig. 1, are inserted between the o posedweb portions 9 on opposite sides of t e wrist pin, and are thenstraightened out to assume the position indicated at the upper portionof Fig. 1, whereby to brace tl... oearings apart and retain them inposition within the piston.

The ends of the locking pins engage in recesses 16 provided in the oposing faces of the webs 9,` so that when t e pms are straightened outthere will be no danger of their becoming accidentally disengaged ordisplaced from position.

The con struction and arrangement I have provided, permits of themanufacture of the pistons at greatly reduced cost, and further resultsin an elimination of the danger m cidnt to pistons of ordinaryconstruction, of the wrist pin workin in'to engagement with the cylinderwall. n the construction I provide, it will b noted that the wrist pinisentirely contai ed within the pistonY y to make such changes in theconstruction,

combination and arrangement of parts thereof as do not depart from thespirit of the invention and t e scope of the appended claims.

I claim:

1. The combination of a piston having an annulargfroove cut in the innerwall thereof, segmenta plates arranged in a. plane transve'tse to the ofthe piston and engaging at their curved edges in the groove bea sleevesformed on the under sides of the plates and adapted to reive a wristpin, web portions formed integrally with and connecting the plates andsleeves, said web portions havi opposed recesses formed on oppositesides o t e bearing sleeves, and locklng keys interposed between the webportion and engaging in the recesses 2. The combination of a pistonhaving an annular groove cut in its inner wall, segmental platesengaging at their curved edges in the groove, caring sleeves carried bythe plates for the reception of a wrist pin, and looking keys interposedbetween the plates for retaining them in engagement with the groove.

3. The combination of a piston having a groove cut in its inner wall,separate wrist pin bearings having portions for engaging in the groove,and locking keys interposed between the bearings for retaining them inengag-[elrlnent with the groove.

4. A e combination of aepiston, separate wrist pin bearings arm-ng inthe piston,

intel-engaging means between the bearings' and the piston, for retainingthe bearings in place within the piston, and means for locking thebearings and the. piston in in5' terenA gement.

5. e combination .with a piston, of separate wrist pin bearings, andmeans for detachably securing the latter in place within the pistou.

ALBERT'J. WANNER.

